This object permanence box for infants is a wonderful piece of equipment that can also be made at home. For example, you can take a small box (about half the size of a shoe box) and cut a round hole exactly the size of the ball on the top of the box. Using the ball shown, your child can experiment by putting the ball through the top round hole and then lifting the lid to find that the ball is inside the box.
Promoting this sorts of physical and intellectual interaction addresses your child's development needs in these early years.
For those of you who have purchased this teaching album, it is important to get or make as much of this series of material as possible -- it is all in the same chapter in the album.